I've added a new tab above that's full of contact information for stitch guide writers. In many cases, your shop can contact the designer for the canvas you are interested in and get the guide that way--which is preferred since that helps support your shop--but if you don't have a shop, or you are interested in a custom guide, or you can't find the guide via your shop, hopefully this will help you reach the creator of that special guide.
If you happen to be a stitch guide writer, please double-check my information. I want it to be accurate so folks can find you. Please email me at email@example.com with corrections and additions or if I inadvertently omitted you. Thank you!